Merge branch 'master' into fix-issue-10244

1 files changed, 182 insertions, 0 deletions

diff --git a/numpy/typing/tests/test_typing.py b/numpy/typing/tests/test_typing.py
new file mode 100644
index 000000000..90de4fd6d
--- /dev/null
+++ b/numpy/typing/tests/test_typing.py
@@ -0,0 +1,182 @@
+import importlib.util
+import itertools
+import os
+import re
+from collections import defaultdict
+from typing import Optional
+
+import pytest
+try:
+    from mypy import api
+except ImportError:
+    NO_MYPY = True
+else:
+    NO_MYPY = False
+
+
+DATA_DIR = os.path.join(os.path.dirname(__file__), "data")
+PASS_DIR = os.path.join(DATA_DIR, "pass")
+FAIL_DIR = os.path.join(DATA_DIR, "fail")
+REVEAL_DIR = os.path.join(DATA_DIR, "reveal")
+MYPY_INI = os.path.join(DATA_DIR, "mypy.ini")
+CACHE_DIR = os.path.join(DATA_DIR, ".mypy_cache")
+
+
+def get_test_cases(directory):
+    for root, _, files in os.walk(directory):
+        for fname in files:
+            if os.path.splitext(fname)[-1] == ".py":
+                fullpath = os.path.join(root, fname)
+                # Use relative path for nice py.test name
+                relpath = os.path.relpath(fullpath, start=directory)
+
+                yield pytest.param(
+                    fullpath,
+                    # Manually specify a name for the test
+                    id=relpath,
+                )
+
+
+@pytest.mark.slow
+@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
+@pytest.mark.parametrize("path", get_test_cases(PASS_DIR))
+def test_success(path):
+    stdout, stderr, exitcode = api.run([
+        "--config-file",
+        MYPY_INI,
+        "--cache-dir",
+        CACHE_DIR,
+        path,
+    ])
+    assert exitcode == 0, stdout
+    assert re.match(r"Success: no issues found in \d+ source files?", stdout.strip())
+
+
+@pytest.mark.slow
+@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
+@pytest.mark.parametrize("path", get_test_cases(FAIL_DIR))
+def test_fail(path):
+    __tracebackhide__ = True
+
+    stdout, stderr, exitcode = api.run([
+        "--config-file",
+        MYPY_INI,
+        "--cache-dir",
+        CACHE_DIR,
+        path,
+    ])
+    assert exitcode != 0
+
+    with open(path) as fin:
+        lines = fin.readlines()
+
+    errors = defaultdict(lambda: "")
+    error_lines = stdout.rstrip("\n").split("\n")
+    assert re.match(
+        r"Found \d+ errors? in \d+ files? \(checked \d+ source files?\)",
+        error_lines[-1].strip(),
+    )
+    for error_line in error_lines[:-1]:
+        error_line = error_line.strip()
+        if not error_line:
+            continue
+
+        match = re.match(
+            r"^.+\.py:(?P<lineno>\d+): (error|note): .+$",
+            error_line,
+        )
+        if match is None:
+            raise ValueError(f"Unexpected error line format: {error_line}")
+        lineno = int(match.group('lineno'))
+        errors[lineno] += error_line
+
+    for i, line in enumerate(lines):
+        lineno = i + 1
+        if line.startswith('#') or (" E:" not in line and lineno not in errors):
+            continue
+
+        target_line = lines[lineno - 1]
+        if "# E:" in target_line:
+            marker = target_line.split("# E:")[-1].strip()
+            expected_error = errors.get(lineno)
+            _test_fail(path, marker, expected_error, lineno)
+        else:
+            pytest.fail(f"Error {repr(errors[lineno])} not found")
+
+
+_FAIL_MSG1 = """Extra error at line {}
+
+Extra error: {!r}
+"""
+
+_FAIL_MSG2 = """Error mismatch at line {}
+
+Expected error: {!r}
+Observed error: {!r}
+"""
+
+
+def _test_fail(path: str, error: str, expected_error: Optional[str], lineno: int) -> None:
+    if expected_error is None:
+        raise AssertionError(_FAIL_MSG1.format(lineno, error))
+    elif error not in expected_error:
+        raise AssertionError(_FAIL_MSG2.format(lineno, expected_error, error))
+
+
+@pytest.mark.slow
+@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
+@pytest.mark.parametrize("path", get_test_cases(REVEAL_DIR))
+def test_reveal(path):
+    __tracebackhide__ = True
+
+    stdout, stderr, exitcode = api.run([
+        "--config-file",
+        MYPY_INI,
+        "--cache-dir",
+        CACHE_DIR,
+        path,
+    ])
+
+    with open(path) as fin:
+        lines = fin.read().replace('*', '').split("\n")
+
+    stdout_list = stdout.replace('*', '').split("\n")
+    for error_line in stdout_list:
+        error_line = error_line.strip()
+        if not error_line:
+            continue
+
+        match = re.match(
+            r"^.+\.py:(?P<lineno>\d+): note: .+$",
+            error_line,
+        )
+        if match is None:
+            raise ValueError(f"Unexpected reveal line format: {error_line}")
+        lineno = int(match.group('lineno')) - 1
+        assert "Revealed type is" in error_line
+
+        marker = lines[lineno].split("# E:")[-1].strip()
+        _test_reveal(path, marker, error_line, 1 + lineno)
+
+
+_REVEAL_MSG = """Reveal mismatch at line {}
+
+Expected reveal: {!r}
+Observed reveal: {!r}
+"""
+
+
+def _test_reveal(path: str, reveal: str, expected_reveal: str, lineno: int) -> None:
+    if reveal not in expected_reveal:
+        raise AssertionError(_REVEAL_MSG.format(lineno, expected_reveal, reveal))
+
+
+@pytest.mark.slow
+@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
+@pytest.mark.parametrize("path", get_test_cases(PASS_DIR))
+def test_code_runs(path):
+    path_without_extension, _ = os.path.splitext(path)
+    dirname, filename = path.split(os.sep)[-2:]
+    spec = importlib.util.spec_from_file_location(f"{dirname}.{filename}", path)
+    test_module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(test_module)